Before attempting to drain your radiator:
* Consult your owner's manual: This is the best source for the exact location and procedure.
* Let the engine cool completely: Hot coolant can cause serious burns.
* Place a drain pan under the radiator: This will catch the coolant.
* Be prepared for the coolant to be hot even after the engine has cooled somewhat.
If you can't locate it easily after checking these things, it's best to consult a repair manual specific to your 2002 Pontiac Grand Am or take it to a mechanic. Improper draining can damage your cooling system.